JPH067281A - Electric controller for dish washing apparatus - Google Patents

Abstract

PURPOSE:To enable the checking of abnormality even after the closing of a power source switch is released. CONSTITUTION:A control circuit 40 controls automatic washing of dishes in a mode (standard course, powerful course and rinsing course) corresponding to the operation of selection switches 44-46 by a program control. During automatic washing of dishes, when abnormality in draining or hot water supply occurs, the occurrence of the abnormality is shown on a display device 43 and after the draining of the washing water in a washing water tank, a data indicating the abnormality is stored into an RAM40c. The indication of the abnormality is released by an OFF operation of a power source switch 41. Then, after turned OFF once, the power source switch 41 is turned ON while manipulating the selection switches 44-46 to turn ON. Thus, the abnormality is shown again on the display device 43 based on a memory data.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric control device for a dishwasher which is activated by turning on a power switch and controls automatic washing of dishes.

[0002]

2. Description of the Related Art Conventionally, an apparatus of this type has been disclosed in, for example, Japanese Patent Laid-Open No.
As disclosed in Japanese Patent Laid-Open No. 3-197429, an abnormality detecting unit for detecting an abnormality of a dishwasher is provided during dishwashing control, and when an abnormality is detected, a user is informed of the abnormality by an indicator, a buzzer, or the like. Was doing.

[0003]

However, in the above-mentioned conventional apparatus, when the power switch is turned off, the abnormality notification is also released, and hence it becomes impossible to confirm the occurrence of the abnormality thereafter. The present invention has been made to solve the above problem, and an object thereof is to provide an electric control device for a dishwasher that enables confirmation of an abnormality that has occurred before and after the power switch is turned on and off. It is in.

[0004]

In order to achieve the above object, the structural features of the invention according to claim 1 are the storage means for storing data representing the abnormality in response to the abnormality detection, and a power supply. There is provided a restoring means for reading out the data stored in the storage means under the condition that the other operation switches are simultaneously operated when the switch is turned on and for notifying the abnormality represented by the data by the notifying means.

Further, the structural feature of the invention according to claim 2 is that in the electric control device for the dishwasher according to claim 1, the other operation switch is a selection switch for selecting an operation mode in cleaning. Is.

[0006]

In the invention according to claim 1 configured as described above, when an abnormality occurs in the washing machine in operation, data indicating the abnormality is stored in the storage means and the power switch is turned on. The data is stored and retained even after the release. Then, when the power switch is turned on again while the other operation switches are being operated, the restoration means notifies the abnormality by the notification means based on the data stored in the storage means. Thus, according to the present invention, even after the power switch is turned off and on, it is possible to confirm the abnormality that has occurred before, which is convenient for repairing the washing machine.

Further, according to the invention of claim 2,
Since the other operation switch is also used as a selection switch for selecting an operation mode in cleaning, it is possible to confirm the abnormality with a simple configuration without separately providing a new operation switch.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows the whole of the dishwasher according to the embodiment. This dishwasher includes a washing tank 20 housed in a box-shaped housing 10. Cleaning tank 2
0 accommodates a rack 23 on the center of which a tableware 22 is put in and out through a front door 21, and supports a pair of cleaning nozzles 24 and 25 on its upper and lower surfaces. The cleaning nozzles 24 and 25 are the circulation pump 26.
With the above operation, the washing water circulated and supplied from the washing water tank 27 formed at the bottom of the washing tank 20 through the circulation pipe 28 is jetted toward the dishes 22 while rotating. Cleaning tank 2
A water supply pipe 31 is connected to the back wall 20a of No. 0 at its outlet, and the water supply pipe 31 supplies high-temperature cleaning water from an external water supply source (not shown) to a cleaning water tank 27 via a water supply valve 32. Supply.

A drain pipe 33 and a sub-tank pipe 34 are branched from the circulation pipe 28. A drainage pump 35 is interposed in the drainage pipe 33.
5 operates to discharge the wash water in the wash water tank 27 to the outside of the machine through the drain pipe 33. The tip of the sub-tank pipe 34 communicates with the sub-tank 36, and a float switch 37 is housed in the tank 36.
The float switch 37 detects that the surface of the cleaning water in the cleaning water tank 27 has reached a reference level indicating the height required for cleaning, etc., and turns on if the height of the water surface is higher than the reference level. If the height of the water surface is lower than the standard level, it will be turned off.

Next, an electric control device for electrically controlling the dishwasher configured as described above will be described with reference to the drawings. FIG. 2 shows the device in a block diagram. This electric control device is provided with a control circuit 40, and electric power is supplied to the circuit 40 via input buses L ₁ and L ₂ . An AC of 120 V is applied to the input bus L ₁ , and the input bus L ₂ is grounded. The coil X ₁ of the power switch 41 and the relay switch 42 is connected between the input buses L ₁ and L ₂ . The power switch 41 is connected to the movable contact 41a which is turned on and off by a manual operation, and is connected at one end to the control circuit 40 and at the other end to a connection point between the movable contact 41a and the coil X ₁ to excite the movable contact 41a. And a coil 41b that is turned off. The coil X ₁ of the relay switch 42 turns on the normally open contact X ₁₁ whose both ends are connected to the control circuit 40 by excitation.

An electric motor 35a of a drain pump 35 is connected between the input bus L ₁ and the output side of the control circuit 40,
Between the connection point of the movable contact 41a of the power switch 41 and the coil X ₁ of the relay switch 42 and the output side of the control circuit 40, the electromagnetic solenoid 32a of the water supply valve 32, the electric motor 26a of the circulation pump 26 and the indicator 43. Are connected. In addition to the float switch 37 described above, a standard course selection switch 44, a strong course selection switch 45, and a rinse course selection switch 46 are connected to the input side of the control circuit 40. The standard course selection switch 44 is for selecting a mode in which the dishes 22 are washed normally. The strong course selection switch 45 is for selecting a mode in which the dishes 22 are strongly washed. The rinse course selection switch 46 is for selecting a mode in which the dishes 22 are only rinsed. The control circuit 40 is shown in FIGS.
CPU40a which executes the program corresponding to the flowchart shown in FIG.
b, R that stores various variables required for executing the program
It is composed of a microcomputer including other circuits such as an AM 40c, a timer, and I / O.

Next, the operation of the embodiment configured as described above will be described. When power is supplied to the control circuit 40 via the input buses L ₁ and L ₂ , the circuit 40 starts executing the “main program” in step 100 of FIG. 1-6 flag FLG1
After initializing FLG6 to "0", the circulation process including steps 104 to 148 in FIGS. 3 and 4 is repeatedly executed.

In this circulation process, the control circuit 40 controls the indicator 43 to be turned off at step 104, and whether the power switch 41 is turned on at step 106 depending on the state of the normally open contact X ₁₁ of the relay switch 42. Determine whether or not. Until the power switch 41 is turned on, the control circuit 4
0 continues to be determined as “NO” in step 106, and the determination process of step 106 is continuously executed. User wash tank 2
After accommodating the rack 23 in which the tableware 22 is placed in 1 and putting the detergent, the movable contact 41a of the power switch 41
When turned on, the electromagnetic solenoid 32a, the electric motor 26
a and the indicator 43 become operable, the coil X ₁ of the relay switch 42 is excited, and the normally open contact X ₁₁ is turned on. As a result, the control circuit 40 causes the step 106
Then, the program is judged to be "YES" and the program is executed in step 108.
Proceed to. In step 108, the first to fourth flags
Set FLG1 to FLG4 to the hexadecimal display value "$ 000", and in steps 110 to 114, select the standard course selection switch 44,
It is determined whether or not either the strong course selection switch 45 or the rinse course selection switch 46 is turned on.
In this case, if the standard course selection switch 44 is turned on, the first flag FL is processed by the processing of steps 110 and 116.
G1 is changed to the hexadecimal display value "$ 001". If the strong course selection switch 45 is on, step 11
The second flag FLG2 is changed to the hexadecimal display value "$ 010" by the processing of 2,118. If the rinse course selection switch 46 is on, the third flag FLG3 is changed to the hexadecimal display value "$ 100" by the processing of steps 114 and 120. If a plurality of selection switches 44 to 46 are simultaneously turned on, a plurality of flags are displayed.
FLG1 to FLG3 are changed to the above values.

Next, the control circuit 40 adds the first to third flags FLG1 to FLG3 in step 122 and sets the addition result as the fourth flag FLG4, and in steps 124 to 130, the fourth flag FLG4. Is the hexadecimal display value "$ 001", "
Whether or not it is equal to any of $ 010 "," $ 100 ", and" $ 111 "is determined. If none of the selection switches 44 to 46 is turned on, the first to fourth flags FLG1
-FLG4 are all kept at the hexadecimal display value "$ 000", so it is judged "NO" at all steps 124 to 130, the program is returned to step 108, and the processing including steps 108 to 130 is repeated. Keep running

First, the case where the tableware 22 is washed by any of the "standard course", "strong course" and "rinse course" will be described. When the user operates only the standard course selection switch 44, the first flag FLG1 is set to the hexadecimal display value "$ 001" and the fourth flag FLG4 is also set to the hexadecimal display value "$ 001". The control circuit 40 determines “YES” in step 124, advances the program to step 132, and executes the “standard course routine”.
To execute. The control circuit 40 starts execution of the "standard course routine" shown in detail in FIG.
First, the control circuit 40 executes a "hot water supply routine" in step 202. This "hot water supply routine" is started in step 300 of FIG. 8, and the hot water supply timer is started from "0" in step 302. The hot water supply timer and various timers described later are to increase their values by "1" at predetermined time intervals by executing an interrupt program (not shown) executed at predetermined time intervals. Next, at step 304, the water supply valve 32 is turned on by exciting the electromagnetic solenoid 32a. As a result, high-temperature clean wash water is supplied from the external water supply source to the water supply pipe 3
1 into the wash water tank 27. In this case, in the normal operating state of the washing machine, the washing water is washed water tank 27.
Since it does not take 10 minutes to reach the reference level of 1, the hot water supply timer does not normally reach the value corresponding to 10 minutes. Therefore, until the wash water reaches the reference level of the wash water tank 27, both are set to "N" in steps 306 and 308.
It is determined to be “O”, and the processing including steps 304 to 308 is repeatedly executed. Then, when the wash water is filled to the reference level of the wash water tank 27, it is determined to be “YES” in step 306, and it is determined in step 310 whether the hot water supply timer has a value corresponding to less than 10 seconds. judge. If the washing machine is normal, the washing water cannot be filled to the reference level in the washing water tank 27 in less than 10 seconds. Therefore, the determination in step 310 is “NO”, and the program proceeds to step 312. Proceeded to. In step 312, the water supply valve 312 is turned off by releasing the excitation of the electromagnetic solenoid 32a.
This "hot water supply routine" is ended.

After executing this "hot water supply routine", the control circuit 40 sets the cleaning time value T _M to a value corresponding to 2 minutes in step 204 of FIG. 5, and executes the "cleaning routine" in step 206. To do. In this "cleaning routine", first, after the routine is started in step 350 of FIG. 9, the cleaning timer is started in step 352. Then, by the processing of steps 354 to 358,
Until the washing timer reaches a value corresponding to the cleaning time value T _M, continues to be the circulation pump 26 is actuated by energizing the electric motor 26a, when it reached a value equal timer corresponds to the cleaning time value T _M The circulation pump 26 is stopped by releasing the energization, and the routine ends in step 360. As a result, the cleaning water containing the detergent in the cleaning water tank 27 is pressure-fed to the cleaning nozzles 24, 25 through the circulation pipe 28 for 2 minutes, and the cleaning nozzles 24, 25
Since the washing water is sprayed onto the tableware 22 while rotating, the tableware 22 is washed for 2 minutes.

After executing this "cleaning routine", the control circuit 40 executes the "drainage routine" in step 208 of FIG. In this "drainage routine", first, FIG.
After starting the routine at 0 to 370, step 37
At 2, the drainage timer is started. Then, by the processing of steps 374 to 378, the drain pump 35 is continuously operated by energizing the electric motor 35a until the drain timer reaches a value corresponding to 30 seconds, and the timer reaches a value corresponding to 30 seconds. Then, the drain pump 35 is stopped by canceling the energization, and step 3
At 80, the routine ends. This makes this 3
The dirty cleaning water in the cleaning water tank 27 is discharged to the outside through the drainage pipe 33 during 0 seconds.

Next, the control circuit 40 proceeds to step 21 of FIG.
At 0, the same "hot water supply routine" as in step 202 is executed. As a result, clean hot water is supplied into the cleaning tank 27. "Hot water supply routine" of this step 210
After executing, the control circuit 40 sets the cleaning time value T _M to a value corresponding to 30 seconds in step 212, and then executes step 21.
At 4, the same "cleaning routine" as described above is executed. As a result, the clean wash water in the wash water tank 27 is pressure-fed to the wash nozzles 24, 25 for 30 seconds via the circulation pipe 28 for 30 seconds, and the wash nozzles 24, 25 are rotated to spray the wash water on the dishes 22. Therefore, the dishes 22 are rinsed for 30 seconds. Then, the control circuit 40 proceeds to step 216.
Since the "drainage routine" similar to the above is executed at, the cleaning water used for the rinsing is discharged to the outside in 30 seconds. After the execution of the "drainage routine" of step 216, the control circuit 40 executes the same processing as steps 210 to 216 in steps 218 to 224.
The tableware 22 is rinsed again for 30 seconds, and the execution of the "standard course routine" is finished at step 226. As a result, in this standard course, the dishes 22 are washed with washing water containing detergent for 2 minutes and then rinsed twice for 30 seconds each.

Also, the user can select a strong course selection switch 4
If only 5 is operated, the second flag FLG2 will be displayed in hexadecimal.
It is set to $ 010 "and the fourth flag FLG4 is 16
Since the decimal display value "$ 010" is set, the control circuit 40
Judges "YES" in step 126 of FIG. 4, advances the program to step 134, and executes the "strong course routine". As shown in detail in FIG. 6, this "strong course routine" comprises steps 230 to 256. Compared with the "standard course routine", the washing time value T _M is set to a value corresponding to 10 minutes in step 234. The only difference is that they are made. As a result, in this strong course, the tableware 22 is washed with washing water containing a detergent for 10 minutes and then rinsed twice for 30 seconds each.

Further, when the user operates only the rinse course selection switch 46, the third flag FLG3 is set to the hexadecimal display value "$ 100" and the fourth flag FLG4 is also set to the hexadecimal display value "$ 100". Since it is set, the control circuit 40 determines “YES” in step 128 of FIG.
The program proceeds to step 136 to execute the "rinse course routine". This "rinse course routine"
As shown in detail in FIG. 7, step 260 similar to steps 210 to 224 of the “standard course routine”.
~ 278. As a result, in this rinsing course, the tableware 22 is only rinsed twice for 30 seconds each.

Steps 132-13 of FIG. 4 as described above.
6 "Standard course routine", "Strong course routine"
Or after the "rinse course routine" is completed, the control circuit 1
34 energizes the electromagnetic solenoid 41b of the power switch 41 for a predetermined time in step 138. As a result, the movable contact 41a is turned off, and the electromagnetic solenoid 32 of the water supply valve 32 is
a, electric motor 26a of circulation pump 26 and indicator 4
3 is disconnected from the input bus L ₁ . After that, the control circuit 40 returns the program to the step 104, controls the extinguishing of the indicator 43 in the step 104, and again waits the operation of the washing machine until the power switch 41 is turned on again in the step 108.

Next, a case where an abnormality occurs in the drainage system of the washing machine will be described. In this case, wash water tank 2
Since the washing water after use in 7 is not drained, the water supply valve 32
The float switch 37 is turned on immediately after the start of water supply via. Therefore, the "hot water supply routine" of FIG.
After determining "YES" in step 306, the control circuit 40 determines "YES" in step 310, that is, the hot water supply timer is smaller than a value corresponding to 10 seconds, and advances the program to step 316 and thereafter. At step 316, the water supply valve 32 is turned off by deenergizing the electromagnetic solenoid 32a, and then at step 318, the indicator 43
The error code indicating the drainage abnormality is displayed at step 320, the wash water in the wash water tank 27 is drained for 30 seconds in the same manner as described above by the processing at steps 320 to 326, and the fifth flag FLG5 is set to "1" at step 328. Set. Next, step 3
At 30, it is determined whether the power switch 41 is turned off,
If the switch 41 is not turned off, the determination process of step 330 is continuously executed. When the user notices the drainage abnormality display on the display unit 43 and turns off the power switch 41, the determination in step 330 is "YES" and the program is returned to step 104 in FIG. In step 104, the drainage abnormality display on the display 43 is turned off, and the operation of the washing machine is stopped until the power switch 41 is turned on in step 106. When the power switch 41 is turned off, no power is supplied to the display unit 43, and the display on the display unit 43 is surely erased as the switch 104 processes.

When an abnormality occurs in the hot water supply system of the washing machine, the washing water is not supplied into the washing water tank 27. Therefore, the float switch 37 is turned off for a long time after the start of the water feeding through the water feeding valve 32. Will continue to be. Therefore, steps 304 to 3 of the "hot water supply routine" in FIG.
During the circulation process consisting of 08, the control circuit 40 executes step 30.
8, "YES", that is, the hot water supply timer is determined to be greater than the value corresponding to 10 minutes, and the program is executed in step 33.
Proceed to 2 or later. After turning off the water supply valve 26 as described above in step 332, in step 334, an error code indicating a hot water supply abnormality is displayed on the display unit 43, and in step 3
By the processing of 36 to 342, the washing water tank 2
The washing water in 7 is drained for 30 seconds, and the sixth flag FLG6 is set to "1" in step 344. Next, as in the case of the drainage abnormality, step 33 is performed until the user notices the hot water supply abnormality on the display 43 and turns off the power switch 41.
The determination process of 0 is continuously executed and the program is advanced to step 104 of FIG. 3 when the switch 41 is turned off. Then, in step 104, the drainage abnormality display on the display 43 is turned off, and in step 106, the operation of the washing machine is stopped until the power switch 41 is turned on.

In the state where the operation of the washing machine is stopped after the occurrence of such an abnormality, when confirming an abnormality that has occurred before, the standard course selection switch 44, the strong course selection switch 45 and the rinse course selection switch 46 are selected. The power switch 41 is turned on while simultaneously turning on.
As a result, the control circuit 40 returns “YE
S ", the program proceeds to step 108, and the first, second and third flags FLG1, FLG2, FLG3 are set to the hexadecimal display value" $ "by the processing of steps 110-120.
001 "," $ 010 ", and" $ 100 ". Then, in step 122, the first to third flags FLG1
~ FLG3 is added and the result of the addition is set as the fourth flag FLG4. Therefore, the fourth flag FLG4 is the hexadecimal display value "$ 11.
1 ”. Therefore, in this case, the control circuit 40 determines“ YES ”in step 130 and advances the program to steps 140 and 142. If a drainage abnormality occurred previously, the fifth flag FLG5 will be "
Since it is set to "1", in step 140, "YE
It is determined to be “S”, and in step 144, an error code indicating a drainage abnormality is displayed on the display 43. Meanwhile, previously,
When a hot water supply abnormality occurs, the sixth flag FLG6 is "1".
Since it is set to "YES" in step 142
Then, in step 146, an error code indicating a hot water supply abnormality is displayed on the display 43. These steps 1
After the processes of 44 and 146, the determination of “NO” is continued in step 148 until the power switch 41 is turned off. If the switch 41 is turned off, the determination of “YES” in step 148 is performed. Then, the program is returned to the step 104.

As can be understood from the above explanation of the operation, according to the above-described embodiment, when the drainage abnormality or the hot water supply abnormality occurs in the washing machine in operation, steps 328 and 3 in FIG.
By the processing of 44, the fifth or sixth flag FLG5, FLG6 is set to "
Then, after the power switch 41 is turned off, if the power switch 41 is turned on while the standard course selection switch 44, the strong course selection switch 45 and the rinse course selection switch 46 are turned on, step 110 -122, 130-146, since the error code indicating the drainage abnormality or the hot water supply abnormality that has occurred previously is displayed on the display 43, the abnormality that occurred before is confirmed even after the power switch 41 is turned off. Therefore, the standard course selection switch 44, the strong course selection switch 45 and the rinse course selection switch 46 are used as the operation switches for displaying the abnormality, It is possible to check for abnormalities with a simple configuration without the need for a new operation switch. It becomes possible.

In the above embodiment, the fifth and sixth flags FLG5 and FLG6 are used as data indicating the abnormality of the washing machine.
Is stored in the RAM 40c, the input bus L
If the power supply to the control circuit 40 via ₁ and L ₂ is released, the data will be erased.
It is also possible to form a part of the above into a non-volatile memory and store the fifth and sixth flags FLG5, FLG6 in the same memory. According to this, even when the power supply to the input buses L ₁ and L ₂ to the electric control device is cut off, the data representing the abnormality can be stored and saved.

Further, in the above embodiment, only the indicator 43 is adopted as the abnormality notifying means, but an alarm buzzer may be used together with the indicator 43 as the means.
In this case, an alarm buzzer is provided in parallel with the display device 43, and when the display control of the display device 43 is performed (steps 318, 334, 14).
No. 4,146), an alarm buzzer is sounded, and at the time of turning off the display 43 (step 104), the sounding of the buzzer may be stopped.

Further, in the above embodiment, when the power switch 41 is turned on while the three switches of the standard course selection switch 44, the strong course selection switch 45 and the rinse course selection switch 46 are turned on at the same time, an error display is displayed. However, the abnormal display may be restored when at least two of the selection switches 44 to 46 and the power switch 41 are simultaneously operated. In this case, in step 130, instead of the determination process of the above embodiment, the determination process may be performed under the condition that two or more bits of the hexadecimal display value are "1".

[Brief description of drawings]

FIG. 1 is a vertical sectional side view schematically showing a dishwasher according to an embodiment of the present invention.

FIG. 2 is a block diagram of an electric control device for the dishwasher.

FIG. 3 is a part of a flowchart of a “main program” executed by the control circuit of FIG.

FIG. 4 is another part of the flowchart of the same “main program”.

5 is a flowchart showing details of a "standard course routine" of FIG. 4. FIG.

FIG. 6 is a flowchart showing details of a “strong course routine” of FIG.

FIG. 7 is a flowchart showing details of a “rinse course routine” of FIG. 4.

FIG. 8 is a flowchart showing details of a “hot water supply routine” in FIGS.

FIG. 9 is a flowchart showing details of a “cleaning routine” in FIGS.

FIG. 10 is a flowchart showing details of a “drainage routine” shown in FIGS.

[Explanation of symbols]

20 ... Wash tank, 22 ... Tableware, 24, 25 ... Wash nozzle,
26 ... Circulation pump, 27 ... Wash water tank, 32 ... Water supply valve, 35 ... Drain pump, 36 ... Sub tank, 37 ... Float switch, 40 ... Control circuit (microcomputer), 40a ... CPU, 40b ... ROM, 40c ... RA
M, 41 ... Power switch, 42 ... Relay switch, 43
... indicator, 44 ... standard course selection switch, 45 ... strong course selection switch, 46 ... rinse course selection switch.

Claims (2)

[Claims] 1. An electric control device for a dishwasher, which is activated by turning on a power switch and controls automatic washing of dishes, wherein an abnormality of the dishwasher is detected during the washing control of the dishes. Abnormality detection means, notification means for notifying an abnormality in response to the abnormality detection, storage means for storing data representing the abnormality in response to the abnormality detection, by the notification means at the time of turning off the power switch Release means for canceling the abnormality notification, and when the power switch is turned on, the data stored in the storage means is read out under the condition that the other operation switches are simultaneously operated, and the abnormality indicated by the data is detected by the notification means. An electric control device for a dishwasher provided with a revival means for informing. 2. The dishwasher according to claim 1 is capable of washing dishes in a plurality of different operation modes, and the other operation switch is a selection switch for selecting the operation mode. Electric control device.